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Highly Oriented Monolayer Graphene Grown on a Cu/Ni(111) Alloy Foil
Huang, Ming,Biswal, Mandakini,Park, Hyo Ju,Jin, Sunghwan,Qu, Deshun,Hong, Seokmo,Zhu, Zhili,Qiu, Lu,Luo, Da,Liu, Xiaochi,Yang, Zheng,Liu, Zhongliu,Huang, Yuan,Lim, Hyunseob,Yoo, Won Jong,Ding, Feng,Wa American Chemical Society 2018 ACS NANO Vol.12 No.6
<P>Fast-growth of single crystal monolayer graphene by CVD using methane and hydrogen has been achieved on “homemade” single crystal Cu/Ni(111) alloy foils over large area. Full coverage was achieved in 5 min or less for a particular range of composition (1.3 at.% to 8.6 at.% Ni), as compared to 60 min for a pure Cu(111) foil under identical growth conditions. These are the bulk atomic percentages of Ni, as a superstructure at the surface of these foils with stoichiometry Cu<SUB>6</SUB>Ni<SUB>1</SUB> (for 1.3 to 7.8 bulk at.% Ni in the Cu/Ni(111) foil) was discovered by low energy electron diffraction (LEED). Complete large area monolayer graphene films are either single crystal or close to single crystal, and include folded regions that are essentially parallel and that were likely wrinkles that “fell over” to bind to the surface; these folds are separated by large, wrinkle-free regions. The folds occur due to the buildup of interfacial compressive stress (and its release) during cooling of the foils from 1075 °C to room temperature. The fold heights measured by atomic force microscopy (AFM) and scanning tunneling microscopy (STM) prove them to all be 3 layers thick, and scanning electron microscopy (SEM) imaging shows them to be around 10 to 300 nm wide and separated by roughly 20 μm. These folds are always essentially perpendicular to the steps in this Cu/Ni(111) substrate. Joining of well-aligned graphene islands (in growths that were terminated prior to full film coverage) was investigated with high magnification SEM and aberration-corrected high-resolution transmission electron microscopy (TEM) as well as AFM, STM, and optical microscopy. These methods show that many of the “join regions” have folds, and these arise from interfacial adhesion mechanics (they are due to the buildup of compressive stress during cool-down, but these folds are different than for the continuous graphene films-they occur due to “weak links” in terms of the interface mechanics). Such Cu/Ni(111) alloy foils are promising substrates for the large-scale synthesis of single-crystal graphene film.</P> [FIG OMISSION]</BR>
Synthesis and Characterization of HPMC Derivatives as Novel Duodenum-Specific Coating Agents
Yuan Huang,ling-li Zheng,Jun Liu,Zhi-rong Zhang 대한약학회 2005 Archives of Pharmacal Research Vol.28 No.3
HPMC (Hydroxypropyl methylcellulose) was chemically modified, using maleic anhydrides, to obtain pH-sensitive HPMCAM (Hydroxypropyl methylcellulose acetate maleate) polymers for use as novel duodenum-specific coating agents. The pharmaceutical properties of HPMCAM, such as film forming, acid values, pH-sensitive values, water vapor permeability, tensile strength and Tg, were investigated, and found to show good film forming properties. The pHsensitive values were 3.0 to 3.7. In vitro results demonstrate that HPMCAM could completely suppress drug release within 2h in a simulated gastric fluid (pH 1.2) and rapidly release the drug in a simulated pathological duodenal fluid (pH 3.4). These results indicate that HPMCAM might be a useful material for a duodenum-specific drug delivery system.
Yuan-Yuan Wu,Xian Shen,Eun-hye Kim,Lin Huang,Ling Hou,You-Ying Tu 한국차학회 2015 한국차학회지 Vol.- No.S
Several previous works showed that the brewing temperature, time, ratio of tea and water had significant effects on the quality of different tea infusions. The appropriate tea brewing condition is vital for a cup of delicious tea. In China, the tea brewing container is also thought to be important for tea brewing. However, there are few works on the effect of tea brewing containers of different materials on tea infusions. In this work, Tieguanyin and Pu’er tea infusions were prepared with tea cups of glass, white porcelain, and purple clay, the effect of different container materials on the taste and quality components of Tieguanyin and Pu’er tea were studied. The tea cups made of glass, white porcelain, and purple clay in same style were used for brewing Tieguanyin and Pu’er tea to obtain different treated tea infusions. The main components such as tea polyphenols, amino acids, total sugars, water extracts, theabrownins, and caffeine in different treated tea infusions were analyzed. All tea infusions were carried out in sensory tests. Among three different cups, the cup made of purple clay had a higher ability in keeping temperature. The content of tea polyphenols and caffeine of Tieguanyin and Pu’er tea were significantly high infused with the purple clay cup. The amino acids and catechins in Tieguanyin, theabrownins in Pu’er tea, are positively associated with the heat property of tea cups. Tieguanyin tea brewing with glass cup and Pu’er tea brewing with purple clay cup are much more welcomed by panelists. In the present work, Tieguanyin tea prepared with glass cups and Pu’er tea prepared with purple clay cup are suggested for a better taste tea infusion.
Yuan, Sheng-Guang,Liao, Wei-Jia,Yang, Jian-Jun,Huang, Guo-Jin,Huang, Zhao-Quan Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.24
Background: This study was conducted to determine DEPDC1 expression in hepatocelluar carcinomas (HCCs) and to reveal its potential role in diagnosis and prognosis of affected patients. Materials and Methods: DEPDC1 expression at the mRNA level was detected by quantitative real-time PCR (qRT-PCR) in 205 cases of HCC and paired adjacent normal liver tissues, and by semi-quantitative RT-PCR in 20 cases. Survival curves were obtained by using Kaplan-Meier method and Log-rank test. Independent predictors associated with regard to disease free survival (DFS) and overall survival (OS) were identified using the Cox proportional hazard model. Results: High DEPDC1 mRNA levels were detected in 144 out of 205 cases (70.24%) of HCC, significantly associated with clinicopathological parameters, including tumor size (${\geq}4cm$), alpha-fetoprotein (${\geq}100ng/ml$), B-C of BCLC stage and recurrence. Kaplan-Meier survival analysis revealed that HCC patients with high DEPDC1 expression had poor OS and DFS. Multivariate analysis demonstrated that high DEPDC1 expression was an independent predictor for OS (HR=1.651; 95% 95%CI, 1.041-2.617; p=0.033) and DFS (HR=1.583; 95%CI, 1.01-2.483; p=0.045). Conclusions: Our results indicate DEPDC1 might be a novel diagnostic marker and an independent prognostic predictor for HCC patients.